6
each connector to a different intercom LINE A and B. The next list shows the signal distribution in the
pin XLR connectors.
XLR INTERCOM LINE
PIN 1
0 V
PIN 2 +VCC
PIN 3
SIGNAL
The intercom line connection in the dual channel beltpack model EM-202-5P is carried through
STAR QUAD
®
shielded cable and male or female XLR 5 pin connectors The dual channel beltpack
provides one male and one female XLR 5 pin connectors, wired internally in parallel mode. The next
list shows the signal distribution in the pin XLR connectors.
XLR INTERCOM LINE
PIN 1
0 V
PIN 2 +VCC LINE A
PIN 3
SIGNAL LINE A
PIN 4 +VCC LINE B
PIN 5
SIGNAL LINE B
Certain rules have to be followed when installing the cables of an intercom system. This is to
avoid ground loops and to minimize the power loss and the possible effect of electromagnetic fields.
Do not connect the XLR pin 1 to the XLR metal housing or to metal wall boxes to avoid ground
loops. The ground loop could increases notably the system background noise.
Do not close the intercom line connection (avoid closed loops). Each intercom line leaves from the
master station towards the remote stations, but it does not return to the master station. If the
connection is closed, a ground loop with the increase from the system noise will take place.
Use high quality cables and minimize its longitude. The DC resistance of a low quality cable or
very long affects to the power consumption, the channels crosstalk and the system frequency
response.
Place the master station the closest possible to the maximum consumption zone; that is to say to
the zone in which more external units are placed.
5. OPERATION
The E-200 intercom system series are designed to allow maximum easy communication
operations between the different control areas in music or theatre live performances, television,
cinema, conference halls, and whatever broad events where multiple and fast communications are
required, with its simultaneous listening-speaking operation system.
The E-200 system dual channel beltpack provides two independent intercom channels. Each
channel provides a CALL switch, a MIC on/off switch (TALK), a listen balance control allows to listen to
the channels independently, or a mix between the two channels.
The Dual Channel Beltpack EM-202 unit was designed for intensive use in portable applications.
An unbreakable plastic belt clip enables easy and secure suitability. Call signalling is Dual, visual and
audible for improving adaptability. The unit can be configured for dynamic or electret microphones
enabling the use of different types of headsets and hands-free earpieces in the market.
DUAL CHANNEL BELTPACK EM-202
(20 pages)
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